I have a pet makeup peeve. Well, I have a few, but the one on my mind right now is that bit of inner upper rim that sometimes shows between eye and liner. I notice it instantly on other people -- I'm sorry, but yes, on you too -- then have to resist the urge to whip out a pencil and fix it. This time, though, with lovely Michelle Yeoh in her beauty shot for Guerlain, I didn't have to resist the urge with Photoshop. Can you see what I mean on the left and the difference on the right? Or here:

Michelle Yeoh for Guerlain, original image: no liner on the upper inner rim of her eyes

Tightlining means lining the inner rim of the eye without smudging it. Actually, for some artists the definition is more specific: lining at the very base of the lashes without getting colour on the fleshy rim. Either way, tightlining the rim of the upper lid is a makeup artist trick I noticed in a mascara ad many, many years ago and adopted instantly.